Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...405..375c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 405, no. 1, p. 375-389.
Astronomy and Astrophysics
Astrophysics
50
Anisotropy, Cosmic Rays, Solar Activity Effects, Interplanetary Medium, Mean Free Path, Solar Magnetic Field
Scientific paper
Neutron monitor data recorded at Thule, Greenland, and McMurdo, Antarctica, are used to determine the cosmic-ray north-south anisotropy over the period 1961-1988. This anisotropy shows an 11-yr sunspot cycle variation, but it does not exhibit a dependence upon the direction of the Sun's magnetic dipole. The north-south anisotropy together with the two components of the diurnal anisotropy comprise a three-dimensional anisotropy, from which we extract detailed new information on the radial and latitudinal gradients of cosmic-ray density and the cosmic-ray scattering mean free path near Earth. We find that the bidirectional latitude gradient reverses sign with the solar magnetic polarity reversal, in accord with the predictions of drift theory, and its magnitude is generally larger during negative solar polarity than during positive polarity. The radial gradient, however, displays only an 11-yr sunspot cycle variation and does not depend upon the solar magnetic polarity in the manner predicted by conventional drift models.
Bieber John W.
Chen Jiasheng
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